Which of the following is a common physical parameter measured in water quality testing?

Temperature is indeed a common physical parameter measured in water quality testing. It plays a significant role in assessing the health of a water body because it influences various chemical and biological processes. For instance, temperature affects the solubility of gases in water, the metabolic rates of aquatic organisms, and the overall ecosystem dynamics.

Other parameters, such as pH level, dissolved oxygen, and conductivity, although important, either represent chemical properties or specific aspects of water quality rather than being classified solely as physical parameters. While these parameters are essential for a comprehensive water quality assessment, temperature stands out in its role as a fundamental physical characteristic that directly influences many aspects of aquatic life and water chemistry.